CN1652041A - Photograph heater with heater for externally heating developing roll surface - Google Patents
Photograph heater with heater for externally heating developing roll surface Download PDFInfo
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- CN1652041A CN1652041A CNA2005100016250A CN200510001625A CN1652041A CN 1652041 A CN1652041 A CN 1652041A CN A2005100016250 A CNA2005100016250 A CN A2005100016250A CN 200510001625 A CN200510001625 A CN 200510001625A CN 1652041 A CN1652041 A CN 1652041A
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- heating
- toner
- well heater
- image
- recording materials
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
- G03G15/2025—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with special means for lubricating and/or cleaning the fixing unit, e.g. applying offset preventing fluid
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- General Physics & Mathematics (AREA)
- Fixing For Electrophotography (AREA)
Abstract
The image heating apparatus for heating a toner image formed on a recording material, includes a rotatable member; heating device for heating an outer peripheral surface of the rotatable member, the heating device including a heater for forming a heating nip portion in cooperation with the rotatable member; back-up device for forming a conveying nip portion in cooperation with the rotatable member, the conveying nip portion conveying the recording material; and control device for controlling a temperature of the heater and a rotation of the rotatable member; wherein the apparatus has a cleaning mode to remove toner from the heating device, wherein the control device, in the cleaning mode, starts energizing the heater to dissipate heat in a condition that the rotatable member stops and afterward stops energizing the heater, and wherein the control device rotates the rotatable member until a part which forms a heating nip portion in a peripheral direction of the rotatable member reaches the conveying nip portion. By the virtue of the present invention, it prevents stain caused by the off-set of toner the recording material in an image heating apparatus.
Description
Technical field
The present invention relates to heat the image heating that is formed on the toner on the recording materials, particularly as the effective image heating that carries the fixing device on image processing systems such as duplicating machine or printer.
Background technology
In the past, be extensive use of the heat fixer device of hot-rolling mode in the fixing device that image processing system had that adopts electrofax mode, electrostatic recording mode, this heat fixer device makes unfixing toner become permanent image as photographic fixing on recording materials by making the recording materials that carried the unfixing toner picture by the clamping part that fixing roller and backer roll with mutual crimping and rotation form.
, the strong in recent years power consumption of wishing to reduce as one of environmental problem in addition, according to the demand in market, wishes to have high picture element and high-speed image output.Therefore, in order to satisfy the such reduction power consumption and the requirement of the high picture element of high speed, the heat fixing device of above-mentioned hot-rolling mode has been carried out various improvement.
Therefore, applicant of the present invention has proposed as image heating fixing device, that can reduce the image of power consumption, shortening heating-up time, the high picture element of output high speed in TOHKEMY 2003-186327 communique.This fixing device, as shown in figure 10, have the fixing roller 20 that has elastic layer 22, from outer surface contact with its fixing roller 20 and form the heating arrangement 24 of pressurization clamping part N, with the fixing roller crimping and form the pressure-producing part 30 of photographic fixing clamping part (conveying clamping part) M, by the recording materials P that is formed with unfixed toner image t with above-mentioned photographic fixing clamping part clamping conveying this uncertain toner image t is carried out heat fixer (following device the type calls the external heating mode).
In addition, the well heater 26 that above-mentioned heating arrangement 24 is had is plate shapes of low heat capacity, is to carry out sliding friction and the type of generating heat in the pressurization clamping part N.Because by forming such structure, and by comparing, can improve the energy density at the clamping part N place of pressurizeing, so heat fixing roll surface expeditiously by the structure on the hot-rolling heat fixing roll surface that contact with the fixing roller surface.
In addition, because the hot-rolling mode of using on the connecting airtight property of the elastic body 22 of fixing roller and recording materials P or toner t and the original high speed machine with elastic layer is identical, so even make the image processing system high speed also can keep high picture element.That is, can realize simultaneously preheating time shortening, consume subduing of electric power, all requirements such as the image output of the high picture element corresponding with high speed.
; in fixing device shown in Figure 10; at heat fixer the occasion of recording materials; move (offset) on fixing roller the time when the toner on the recording materials is sticking, its sticking transposition toner is because the sliding friction of heater block and fixing roller and attached on the heater block surface, again by carrying out the heat fixer action repeatedly; sticking transposition toner savings is on the heater block surface; when surpassing when a certain amount of, toner becomes bad image transfer to recording materials from the heater block sur-face peeling.
Summary of the invention
In view of the above problems, the objective of the invention is to, provide inhibition by the sticking image heating that moves the pollution of the recording materials that the toner on image heating causes.
Another object of the present invention is, the image heating of inhibition attached to the savings of the toner on the heating arrangement of the image heating of external heating mode is provided.
A further object of the present invention is, a kind of image heating is provided, this image heating has rotatable part, contain the well heater that forms the heating clamping part with this rotatable part, heat the heating arrangements of the outer peripheral face of this rotatable part, form the supporting mechanism of the conveying pincers of carrying recording materials with this rotatable part, control the control gear of the rotation of the temperature of this well heater and this rotatable part, this device has the cleaning mode of removing toner from this heating arrangements, when cleaning mode, this control gear is switched on to well heater, stop energising then, make this rotatable part rotation, the part that forms the heating clamping part on the circumferencial direction at rotatable part arrives aforementioned conveying pincers.
Other purpose of the present invention is read following detailed description simultaneously by the reference accompanying drawing and will be obtained clearly understanding.
Description of drawings
Fig. 1 is the tactic pattern figure of an example of image processing system.
Fig. 2 is the key diagram of the sequence of movement of image processing system.
Fig. 3 is the tactic pattern figure of the heat fixing device of embodiment 1.
Fig. 4 is the tactic pattern figure of the B-B line of heat fixing device shown in Figure 2.
Fig. 5 is the enlarged drawing of heating clamping part shown in Figure 2.
The figure of the rotation drive controlling of the temperature adjustment control of the well heater when Fig. 6 is pattern ground expression execution cleaning mode, the temperature transition of this well heater and fixing roller.
Fig. 7 A transfers to action specification figure on the pressure-producing part to the adhering toner of heating clamping part from fixing roller.
Fig. 7 B transfers to action specification figure on the recording materials transferring to toner on the pressure-producing part.
Fig. 8 is the tactic pattern figure of the heat fixing device of embodiment 2.
Fig. 9 A makes the adhering toner of heating clamping part transfer to action specification figure on the pressure-producing part from fixing roller.
Fig. 9 B makes the toner of transferring on the pressure-producing part transfer to action specification figure on the recording materials.
Figure 10 is the tactic pattern figure of original heat fixing device.
Figure 11 is the action specification figure of the variation of embodiment 1.
Embodiment
Embodiments of the present invention are described with reference to the accompanying drawings.
＜embodiment 1 〉
(1) image processing system example
Fig. 1 is the tactic pattern figure of an example of image processing system.This routine image processing system is the laser printer that utilizes transfer printing mode electrophotographic method.
The 1st, conduct is as the Electrophtography photosensor (following note is made photosensitive drums) of the rotation drum type of supporting body, and photosensitive materials such as OPC, amorphism Se, amorphism Si are formed on the matrix cylindraceous of aluminium or nickel etc.
Secondly, its charged face is exposed according to image information by laser scanner 3.Be that laser scanner 3 usefulness are exposed to the uniform charged treated side of rotating photosensitive drum 1 by the laser beam L of ON/OFF control (modulation control) according to the electric data image signal of the sequential of image information.Thus, the exposure portion potential decay of the uniform charged face of photosensitive drums 1 and on the photosensitive drums face, having formed and the corresponding electrostatic latent image of image information.
This electrostatic latent image develops to toner image by developing apparatus 4 and by visual.As developing method, use jump development method, 2 component development methods, FEED development method etc., be picture to be exposed and the discharged-area development use that combines mostly.
Visual toner picture, photosensitive drums 1 contact with conduct with photosensitive drums 1 crimping the transfer roll 5 of transfer device pressure contact portion, be among the transfer nip A, be transferred on never illustrated paper-feeding mechanism portion supplies to this transfer nip with control time of regulation the face of recording materials P from 1 of photosensitive drums.
That is,, the writing position of the front end of toner image and recording materials on the photosensitive drums 1 is aimed at according to time of delivery with the front position information Control recording materials of sensor 6 detected recording materials P.The recording materials P that carries with official hour is carried with certain plus-pressure clamping by photosensitive drums 1 and transfer roll 5 in transfer nip A, the toner image on 1 of the photosensitive drums with electric power and pressure transfer printing on recording materials P.
The recording materials P that has passed through transfer nip A separates with the photosensitive drums 1 of rotation, is fed to heat fixing device 8, and unfixing toner looks like to be heated photographic fixing on the recording materials face and become permanent image.The recording materials of having accepted image fixing are transported to paper-discharge mechanism portion 9.
In addition, the remaining remaining remaining toner of transfer printing on the photosensitive drums 1 after recording materials separate is removed from photosensitive drums 1 surface by cleaning device 7, makes photosensitive drums 1 use for imaging repeatedly.
(2) actuating length of printer
Next the sequence of movement of above-mentioned printer is described according to Fig. 2.
A. many rotating distances before: be printer starting action during (during the starting action, between warming up period).By connecting main power switch, the main motor driven photosensitive drums 1 of drive unit makes its rotation, carries out the warming-up exercise of predetermined process machine.
B. preceding rotating distance: carry out and print during the preceding action.Be performed after many rotating distances before being connected on when rotating distance has been imported print signal before being somebody's turn to do in preceding many rotating distances.When not importing print signal, the driving that preceding many rotating distances finish the main motor in back is temporarily stopped, and the rotation of photosensitive drums 1 drives and is stopped, and printer all is maintained at preparation (standby) state before print signal is transfused to.When the input print signal, rotating distance before carrying out.
C. print stroke (image form stroke, imaging stroke): when the preceding rotating distance of regulation finishes, then carry out imaging processing to photosensitive drums 1, go up the toner picture that transfer printing forms to recording materials P on 1 of photosensitive drums, the photographic fixing of carrying out the toner picture by fixing mechanism is handled and is printed image and forms thing.In the occasion of printing (printing continuously) pattern continuously, the setting type face that above-mentioned printing stroke is put rules into practice repeatedly for several times.
D. stroke between paper: the rear end that is one page recording materials P in printing mode continuously is by behind the transfer nip A, and arriving between the transfer nip A to the leading section of the recording materials P of one page down is during recording materials P non-among the transfer nip A crosses the paper state.
E. rotating distance after: be after the printing stroke of last recording materials P finishes, to continue CD-ROM drive motor a period of time, and driving photosensitive drums 1 is rotated, during the back action that puts rules into practice.
F. clean stroke (cleaning procedure): be remove savings the sticking transposition toner of the heating clamping part of the fixing roller of heat fixing device 8 and heater block clean heater block during.Be described in detail again later on for the cleaning stroke.
G. standby: when the back rotating distance of regulation finished, the driving of main motor was stopped, and the rotation of photosensitive drums 1 drives and is stopped, and printer remained on holding state before input print start signal next time.
In the occasion of only printing one page, after it printed end, printer warp rotating distance later became holding state.When the input print signal, printer is transferred to preceding rotating distance under holding state.
During the printing stroke of C image when forming, when the cleaning stroke of the back rotating distance of stroke, E, F becomes non-image formation between the paper of preceding many rotating distances of A, the preceding rotating distance of B, D when imaging (non-).
Drive systems such as main motor driven photosensitive drums 1, paper-feeding mechanism portion, developing apparatus 4, transfer device 5, heat fixing device 6, paper-discharge mechanism portion 9.
(3) heat fixing device
Fig. 3 is the structural representation of the heat fixing device 6 of present embodiment, and Fig. 4 is the structural representation of the B-B line of heat fixing device shown in Figure 2.
This heat fixing device roughly comprises: have the fixing roller (rotatable part) 20 of elastic layer, contact with the outside surface (outer peripheral face) of this fixing roller 20 and form the pressurization clamping part N, with the heater block (heating arrangements) 24 of the roller outside surface heat temperature raising of fixing roller 20, with fixing roller 20 mutually crimping form the pressure-producing part (supporting mechanism) 30 of photographic fixing clamping part (conveying clamping part) M.
1) fixing roller (rotatable part) 20
But, when big and coefficient of heat conductivity is big slightly when the thermal capacity of fixing roller 20, owing to absorb the heat of accepting from outside surface easily, the fixing roller surface temperature is difficult to rise, so elastic layer 22 uses low heat capacity and coefficient of heat conductivity material low, that effect of heat insulation is high as far as possible, this rises to the needed time of set point of temperature to shortening fixing roller surface temperature is favourable.
At this, the solid rubber of above-mentioned silicon rubber, its coefficient of heat conductivity is 0.25～0.29W/mk, and the coefficient of heat conductivity of spongy rubber bubble rubber is 0.11～0.16W/mk, and the coefficient of heat conductivity of spongy rubber bubble rubber is the only about half of of solid rubber.
In addition, the proportion relevant with thermal capacity, solid rubber are about 1.05～1.30, and spongy rubber bubble rubber is about 0.75～0.85.
Thereby as the preferred configuration of elastic layer 22, preferably coefficient of heat conductivity is≤0.15W/mk, proportion is≤and 0.85 high spongy rubber layer or the bubble rubber layer of effect of heat insulation.
In addition, the profile of fixing roller 20 (external diameter) hour can suppress thermal capacity, but when too small because the pressurization clamping part N is difficult to work, so must be appropriate diameter.
About the wall thickness of elastic layer 22, if thin excessively, then heat is run away to metal axle 21, so must be suitable thickness.
Considering above-mentioned situation, in the present embodiment, in order to form suitable pressurization clamping part N and to reduce thermal capacity, is the bubble rubber formation elastic layer 22 of 4mm with wall thickness, uses the fixing roller 20 of profile φ 20mm.
On above-mentioned elastic layer 22, form perfluoroalkoxy resin (PFA), polyflon (PTFE), tetrafluoroethene-hexafluoropropylene resin fluororesin release layers 23 such as (FEP).Release layer 23 can be the release layer of tubulose, also can form with applying coating, but the permanance of tubulose release layer is outstanding.
The fixing roller 20 of said structure, as shown in Figure 4,51 rotations freely are bearing on the 1 pair roller support unit 50 the both ends 21a of axle 21 by bearing.
2) heating arrangement 24
On the surface of well heater 26, the protection sliding layer can be set, be used to make the release layer 23 of fixing roller 20 not wear and tear because of sliding friction.As its example; can consider separately and even to cover perfluoroalkoxy resin (PFA), polyflon (PTFE), tetrafluoroethene one hexafluoropropylene resin (FEP), ethene-tetrafluoroethylene copolymer resins (ETFE), polychlorotrifluoroethylene resin (CTEF), Kynoar fluororesin layers such as (PVDF), perhaps protective seams such as the dryness tunicle lubricant that constitutes by graphite, the same carbon of adamas (DLC), molybdenum disulfide etc., glass coating with mixing.
The 25th, the heat insulation support member of maintenance well heater 26.The both ends of heat insulation support member 25 by 20 pressurizations of 53 pairs of fixing rollers of pressing mechanism (for example coil spring), form the heating clamping part N by its plus-pressure as shown in Figure 4 between well heater 26 and fixing roller 20.This heat insulation support member 25 has the effect that prevents to the reverse direction heat radiation of heating clamping part N, is formed by liquid crystal polymer, phenolics, PPS, PEEK etc.
In addition, configuration is used to detect the thermistor equitemperature detecting element (temperature testing organization) 27 of the temperature of the ceramic substrate that heats up corresponding to the heating of heating power resistive layer on the back side of well heater 26.According to the signal of this detector unit 27, temperature control part shown in Figure 3 (temperature control device) 34 is by suitably controlling the temperature that not shown electrode part from the length direction end that is in the heating power resistive layer is added to control heaters 26 such as the dutycycle of the voltage on the heating power resistive layer and wave number.That is, temperature control part 34 controls are to the energising of well heater 26, so that the detected temperatures of detector unit 27 maintains on the design temperature.In the fixing device of present embodiment, by the temperature of control heater 26, the result can make the surface from the pressurization clamping part N to the fixing roller 20 of delivery section M among the surface of fixing roller 20 remain on the temperature that is suitable for photographic fixing., finish by not shown connector to the DC of temperature control part 34 energising from detector unit 27 through not shown DC conducting parts and DC electrode part.
3) pressure-producing part (supporting mechanism) 30
Pressure-producing part 30 is following such structures.The 33rd, the sliding film of drum (flexible sleeve insert) is having the resinous film as basic unit such as thermoplastic polyamide, polyamide-imide, PEEK, PPS, PFA, PTFE, FEP.Film thickness is considered factors such as intensity, be 〉=20 μ m and＜the suitable scope of 150 μ m.
In addition, the 31st, the sliding panel that the inside of sliding film 33 possesses (slide unit), the 32nd, the heat insulation support member of maintenance sliding panel 31.
The both ends of heat insulation support member 32 as shown in Figure 4, by 20 pressurizations of 54 pairs of fixing rollers of pressing mechanism (for example coil spring), form essential photographic fixing clamping part (conveying clamping part) M of photographic fixing across sliding film 33 between sliding panel 31 and fixing roller 20.Heat insulation support member 32 is same by forming as liquid crystal polymer, phenolics, PPS, PEEK etc. with thermal insulation, stable on heating resin with the heat insulation support member 25 of heater block 24.Therefore, the inner peripheral surface of sliding film 33 contacts with sliding panel 31, and its outer peripheral face contacts with the outer peripheral face of fixing roller 20.
In addition, sliding panel 31 is by as the forming with same liquid crystal polymer, phenolics, PPS, the PEEK etc. of heat insulation support member 32 of material little with the friction of sliding film 33 and that have thermal insulation, and preferably coating reduces the sliding layer of frictional resistance in its surface.As its example, owing to be and the identical coating of lip-deep sliding layer that is arranged on well heater 26, Therefore, omited explanation.
In this example, sliding panel 31 and heat insulation support member 32 are parts independently respectively, also can be one-body molded they and on slipper, apply sliding layer, can further reduce cost.In addition, lubricated wet goods lubricant can be set on a small quantity between sliding film 33 and sliding panel 31, be used to reduce frictional resistance.
In the present embodiment, because the diameter of fixing roller is that the line angulation of line and the central authorities of center that is connected fixed roll 20 and the M of fixing roller portion of the central authorities of φ 20mm, the center that links fixing roller 20 and pressurization clamping part N is 120 °, the transporting velocity of recording materials is 250mm/Sec, so fixing roller 20 surfaces are 0.08 second from pressurization clamping part N central mobile to the photographic fixing clamping part M needed time of center, and are very short.And as mentioned above, because the elastic layer 22 use coefficient of heat conductivity≤0.15W/mk of fixing roller 20, proportion are≤0.85 high spongy rubber layer or the bubble rubber layer of effect of heat insulation, reach photographic fixing clamping part M so can reduce temperature ground hardly by the fixing roller surf zone of well heater 26 heating at pressurization clamping part N place.
4) action
In such structure, fixing roller 20 from the length direction end through axle 21 by main motor (driving mechanism) 35 of device shown in Figure 3 clockwise direction (recording materials throughput direction) driven in rotation to arrow.Main motor 35 is by 36 controls of Spin Control portion.Temperature control part 34 and Spin Control portion 36 are by control part 37 management.The rotation that is accompanied by this fixing roller 20 drives, and the sliding film 33 of supporting mechanism 30 sides is accepted revolving force and closely contacted with sliding panel 31 surfaces at photographic fixing clamping part M place.While the driven rotation of counter clockwise direction of sliding at the arrow of the lateral of heat insulation support member 32 figure.
In addition, after the heating power resistive layer energising of the well heater 26 of fixing roller 20, well heater 26 heats up to the control temperature (design temperature) of regulation rapidly, by the energising of such as the thermoregulating system control that comprises detector unit 27 and temperature control part 34 etc., make well heater 26 remain the control temperature of regulation to the heating power resistive layer.
Then, the heating outside surface heating to rotation fixing roller 20 from the outside at pressurization clamping part N place by well heater 26 makes on its fixing temperature that heats to regulation rapidly.As mentioned above, in the fixing device of present embodiment, by temperature control heater 26, the result can make and keep being suitable for the temperature of photographic fixing towards the surface of the fixing roller 20 of carrying clamping part M to advance from the pressurization clamping part N among the surface of fixing roller 20.
Be driven in rotation at fixing roller 20, and its outside surface is heated temperature adjustment under the state of fixing temperature of regulation, is imported in the photographic fixing clamping part M that is formed by fixing roller 20 and pressure-producing part 30 and is carried by photographic fixing clamping part M clamping along thermotolerance photographic fixing input guide rail 55 from transfer nip A side and formation and the recording materials P that carries the unfixing toner picture.Thus, unfixing toner as t at photographic fixing clamping part M place by heat and the pressure photographic fixing on recording materials P face.
Carrying recording materials P with photographic fixing clamping part M clamping and carrying out the occasion of the heat fixer of unfixing toner picture, on well heater 26 parts of sticking transposition toner t savings in the pressurization clamping part N from the trace on the recording materials P.With Fig. 5 its appearance is described.Fig. 5 is the enlarged drawing of the pressurization clamping part N that forms of the pressurization by well heater 26 and fixing roller 20.The sticking transposition toner t of the trace on the fixing roller 20 at first is blocked in the fixing roller sense of rotation upstream of pressurization clamping part N.But, the most toner that is blocked of upstream side in the pressurization clamping part N, thereafter, because of heating is melted, follow the rotation of fixing roller 20, the well heater 26 in the pressurization clamping part N and the sliding friction portion of fixing roller 20 move to the fixing roller sense of rotation downstream of heating clamping part N at leisure, and as representing with t ', savings is on the surface of the well heater 26 that has passed through the heating clamping part N.When continuing to print same as before, the toner t ' of savings just turns back on the surface of fixing roller 20 soon, is transported to photographic fixing clamping part M and transfers on the face (image print face) of fixing roller 20 sides of recording materials, has polluted recording materials P.
5) explanation of control model (cleaning mode)
For this reason, in the present embodiment, when printing end, well heater 26 is quit work, after carrying out aforesaid back rotating distance, carry out the control model (cleaning procedure) (that is, the cleaning mode of present embodiment automatically performs) of purge heater 26 after the heating process that adds the toner picture on the thermal recording material [photographic fixing operation] finishes by control part shown in Figure 3 37.Fig. 6 schematically represents to carry out the temperature adjustment of well heater 26 of heating usefulness of the occasion of above-mentioned control model and controls the temperature transition of this well heater 26 and the rotation drive controlling of fixing roller 10.
When entering control model, Spin Control portion 36 quits work main motor 35 and stops the driving of fixing roller 20, under this state, the heating power resistive layer of 34 pairs of well heaters 26 of temperature control part energising and make well heater 26 heat up (heating) to the set point of temperature T2 of 〉=toner melt temperature, the control that begins to keep temperature T 2.By this heating the toner t ' in downstream attached to the pressurization clamping part N is mutually combined.The temperature of well heater 26 (being the detected temperatures of detector unit 27) is controlled so as to the time of holding temperature T2, is to carry out toner t ' to mutually combine the needed time, through behind the required time, the heating power resistive layer is cut off the power supply.The fixing roller 20 that uses in the present embodiment owing to have low heat capacity and a high elastic layer 22 of effect of heat insulation, so when to the outage of well heater 26 after after a while, the surface temperature of fixing roller 20 becomes the temperature lower than well heater 26.Therefore, near the toner t ' of combination in the pressurization clamping part N and the outlet, by on cool fixing roller 20 coolings and beginning and the fixing roller 20 admittedly.Thus, the toner t ' of combination becomes the easy state that breaks away from from well heater 26 surfaces in the pressurization clamping part N and near the outlet.
Under such state, import the detected temperatures of well heaters 26 from detector unit 27, when its detected temperatures becomes the temperature T 3 of the regulation lower than above-mentioned toner melt temperature, connect main motor 35 and fixing roller 20 is rotated to clockwise direction (recording materials throughput direction) by Spin Control portion 36.Though temperature T 3 is lower than toner melt temperature, is set in toner t ' and is fixed in fixing roller 20 surperficial going up on the temperature before fully.Therefore to can be compared to the toner melt temperature most low and more than the toner softening point, the toner t ' when fixing roller 20 begins to rotate is the semi-molten state for temperature T 3.In addition, in the present embodiment, the rotation of being managed cooled fixing roller 20 by the temperature (detected temperatures of detector unit 27) of well heater 26 begins (just beginning rotation if temperature becomes T3), but also can manage with the time from the cooling beginning.The rotation amount (anglec of rotation) of the fixing roller 20 during cleaning mode can be the rotation amount that forwards photographic fixing clamping part M in the zone that forms the heating clamping part N on the circumferencial direction of fixing roller during at cleaning mode at least.Owing to do not have too big meaning than its rotation of Duoing, so be preferably in 360 °.
Remain on the toner t ' on the fixing roller 20, follow the rotation of fixing roller 20 to be transported to photographic fixing clamping part (conveying clamping part) M.
The thermal capacity of the sliding film 33 of supporting mechanism 30 is very low, and in cleaning mode warm-up mill 26 be heated and cool off well heater 26 during, do not accept the heat of supplying with from fixing roller 20 sides.Therefore, remain on toner t ' on the fixing roller 20 when arriving photographic fixing clamping part M, the low temperature of temperature in heated zone when film 33 surfaces become than the cleaning mode of fixing roller 20.Thereby, remain on the toner t ' on the fixing roller 20, in the time of in arriving photographic fixing clamping part M, the fixing roller 20 in photographic fixing clamping part M is transferred on the low film of temperature 33 surfaces.This occasion, fixing roller 20 make toner t ' rotate the anglec of rotation that moves to the needed regulation of photographic fixing clamping part M from well heater 26 at least, and then, Spin Control portion 36 stops the rotation and the finishing control pattern by making main motor 35.
Because control model finishes, image processing system becomes holding state.
In the relation of design temperature T2 when the design temperature T1 of the well heater when the photographic fixing operation and cleaning mode, in Fig. 6, become T1＜T2, if but temperature T 2 is 〉=the toner melt temperature then to be not limited to this magnitude relationship, also can be T1=T2, can be T1＞T2 as shown in Figure 11 also.
As mentioned above, when commencing signal is printed in input under the state that is attached at toner on the film 33, carry out the next one through preceding rotating distance and print action, shown in Fig. 7 B, recording materials portion enters in the photographic fixing clamping part M of heat fixing device 8.In preceding rotation operation, well heater heating and heat fixing roll 20, but film 33 is also heated from the heat of fixing roller 20 in photographic fixing clamping part M.Because recording materials P is a normal temperature, so transfer on the face (non-image printing surface) of film 33 sides of the recording materials P lower than film 33 temperature from film 33 surfaces in photographic fixing clamping part M attached to film 33 lip-deep toner t ', P is discharged from recording materials.
So, when carrying out the cleaning mode (control model) of present embodiment, when carrying out printing, can make and discharge with recording materials P attached to the toner on the well heater 26.
At this, above-mentioned control model can be carried out behind several pages～tens of pages recording materials P of print processing.This occasion, in photographic fixing clamping part M attached to the outside surface of fixing roller 20 on and be deposited in the sticking transposition toner t ' in the pressurization clamping part N downstream of well heater 26, several pages～tens of pages recording materials P during by photographic fixing clamping part M the accumulation program be toning dosage with the trace of the invisible degree of eyes, so remain on the toner t ' that the toner t ' on the film 33 promptly is discharged from the back side attached to recording materials P, also be certainly with the invisible levels of eyes.
In addition, after control model is not limited to the back rotating distance, for example also can be behind preceding many rotating distances shown in Figure 2, carry out after the standby or behind the preceding rotating distance.
In this routine heat fixing device, be used to make the temperature adjustment of interrupting well heater 26 and the sense of rotation that is maintained at the fixing roller 20 of the toner t ' arrival photographic fixing clamping part M on the fixing roller 20, can be as above-mentioned embodiment, being the throughput direction (clockwise direction) of recording materials P, also can be the direction (counter-clockwise direction) opposite with the throughput direction of recording materials P.Preferably identical direction with the throughput direction of recording materials.But being used for having transferred to the sense of rotation that toner t ' on the film 33 transfers to the fixing roller 20 on the recording materials P is the throughput direction of recording materials P.
6) estimate
Use the heat fixing device of above explanation to print action, confirmed the effect of cleaning procedure.In this evaluation, the transporting velocity of recording materials (below be called processing speed) is decided to be 250mm/Sec, and the temperature adjustment temperature T 1 of the well heater 26 in the printing is 230 ℃, and the temperature adjustment temperature T 2 in the cleaning procedure is decided to be 180 ℃.In addition, be 3 seconds the heat time heating time in the cleaning procedure, was decided to be for 6 seconds cool time thereafter, and then step-by-step movement is rotated fixing roller 20, carrying to photographic fixing clamping part M attached to the toner on the fixing roller.
In addition, the toner that uses in this evaluation is monochromatic crushed toner, and softening temperature is 60～70 ℃, and melt temperature is 90～100 ℃.Therefore, above-mentioned 6 seconds of cool time are that the temperature of well heater 26 drops to about 80 ℃ of needed times.Have, recording materials use letter size and basic weight (level ground amount) to be 90g/mm again
2The more coarse paper (rag paper) of superficiality.In order to make these recording materials satisfy fixation performance with the processing speed of 250mm/Sec, the temperature that must make photographic fixing clamping part M is 180 ℃, and heter temperature at this moment is 230 ℃.
In the cleaning procedure after the back rotation finishes, well heater with carrying out temperature adjustment 180 ℃ of 3 seconds, is made attached to the toner t ' fusion on the heater surfaces, by the cooling in 6 seconds, the pressurization clamping part N becomes about 80 ℃ then., after rotating being transported to photographic fixing clamping part M attached to the toner t ' on the fixing roller, step-by-step movement toner t ' is transferred on the lower film of surface temperature 33 through this cool time at photographic fixing clamping part M place.The toner t ' that has transferred on the film 33 is discharged attached to the non-printing surface side of the recording materials that pass through by ensuing printing action.This cleaning procedure is owing to carry out (promptly after each printing release, in the occasion that is the multi-page printing order, after printing end, the number of pages of appointment carries out), because toner t ' is (continuous about the 500 pages printing pile up toner be micro-) of denier, so even attached on the recording materials also being level without any problem.
The intermittence of carrying out recording materials P not carrying out the cleaning procedure after above-mentioned printing finishes, about 2000 pages just produced the bad image that causes attached to the sticking transposition toner on the well heater face when crossing paper long duration test (2 pages/1 minute).In contrast, cross in the paper long duration test at the intermittence of the cleaning procedure that uses present embodiment, even 20,000 pages do not produce bad image yet.
Cleaning procedure by present embodiment, even occasion in the deviations such as surperficial coating roughness of having heaters 26, also can reduce the amount that is trapped in the sticking transposition toner on the well heater effectively, so do not need the surperficial coating of well heater is made required above high precision, can improve the qualification rate of well heater thus, can reduce cost.
＜embodiment 2 〉
Below the 2nd embodiment of the present invention is described, the structure that the image processing system of present embodiment is all, since identical with the 1st embodiment, the Therefore, omited explanation.
Fig. 8 represents the formation of the heat fixing device of present embodiment.In the heat fixing device shown in this example, a plurality of heater blocks have been to use with the difference of aforementioned the 1st embodiment, with respect to the sense of rotation of fixing roller 20, with 2 the heater block heat fixing rolls 20 of above-mentioned heating arrangement 24 with another heater block 40 of the upstream side that is positioned at this heating arrangement 24.Other structure is saved explanation because of identical event with aforementioned the 1st embodiment.In heater block 40, the 41st, heat insulation support member, the 42nd, well heater, the 43rd, detector unit.
Using the occasion of a plurality of (being 2 in this example) heating arrangement 2440, sticking transposition toner is to be positioned on the well heater face of upstream side of above-mentioned heating arrangement 24 attached to the sense of rotation with respect to fixing roller 20 mainly.In the occasion of present embodiment, on 42 of the well heaters of heater block 40.
1) explanation of control model
Therefore, by shown in Figure 6 control model (cleaning procedure) the identical control model of control part 37 execution with the 1st embodiment.In the occasion of the device of present embodiment, during printing (as heating time) with two heater heats fixing rollers 20, but in cleaning mode, the well heater 26 in the sense of rotation the during printing of fixing roller 20 (recording materials throughput direction) downstream does not generate heat.The occasion of at least 3 well heaters is being set, can only allowing the well heater heating of upstream side.In this routine control model, shown in Fig. 9 A, toner t ' is transferred to after fixing roller 20 surface goes up from well heater 42 faces, the direction of rotation fixing roller 20 must opposite with the recording materials throughput direction (counterclockwise).When the throughput direction that makes fixing roller 20 to recording materials P rotates, transfer on well heater 26 surfaces of fixing roller 20 lip-deep toner t ' attached to heating arrangement 24 shown in Figure 8 from well heater 42, can not arrive pressure-producing part 30, can not discharge by recording materials P.Therefore, when the cleaning action of present embodiment, make fixing roller 20 to the direction rotation opposite and toner t ' is transferred on pressure-producing part 30 (film 33) surface from fixing roller 20 in photographic fixing clamping part M with the throughput direction of recording materials P.This occasion, fixing roller 20 make toner t ' rotation transfer to the anglec of rotation of pressure-producing part 30 surperficial necessary regulations from well heater 42 parts at least, and Spin Control portion 36 stops and the finishing control pattern by making main motor 35 then.
By the finishing control pattern, image processing system becomes holding state.
When image processing system is imported the printing commencing signal under holding state, print action through carrying out the next one behind the preceding rotating distance, shown in Fig. 9 B, recording materials P enters in the photographic fixing clamping part M of heat fixing device 8.This occasion because recording materials P is a normal temperature, is transferred to pressure-producing part 30 lip-deep toner t ' and is transferred on the face (non-image printing surface) of the pressure-producing part side of recording materials P from the pressure-producing part surface, and P is discharged from recording materials.
2) estimate
After above-mentioned printing finishes, do not carry out cleaning procedure and when carrying out intermittence of recording materials P logical paper long duration test (2 pages/1 minute), print about 3000 pages and just produced the bad image that causes by attached to the sticking transposition toner on the well heater face.Comparing with the 1st embodiment, up to the reason that the number of pages that produces bad image increases, is because 2 heater blocks are arranged, and the amount that continues the sticking transposition toner of savings has been increased.In contrast, cross in the paper long duration test, also do not produce bad image even print 30,000 pages at the intermittence of the cleaning procedure that uses present embodiment.
[other]
1) image heating of the present invention is not limited to the heat fixing device of embodiment, also can carry record images material P as heating and improve the mechanism arrangement that the image heating heat treated large tracts of land of prima facie image heating such as gloss, interim photographic fixing has been carried the record images material.
2) forming the mechanism of unfixing toner picture on recording materials P, is any one of imaging processing, transfer printing mode direct mode of electrofax mode electrostatic recording mode.
The present invention is not restricted to the described embodiments, and comprises the variation in the technological thought.
Claims (12)
1. an image heating is the image heating that heats the toner picture that forms on recording materials, has:
Rotatable part;
Heating arrangements, this heating arrangements contain the well heater that forms the heating clamping part with this rotatable part, are used to heat the outer peripheral face of this rotatable part;
Supporting mechanism, this supporting mechanism forms the conveying pincers of carrying recording materials with this rotatable part;
Control gear, this control gear are controlled the temperature of this well heater and the rotation of this rotatable part,
This device has the cleaning mode of removing toner from this heating arrangements, in cleaning mode, this control gear is switched on to well heater, outage then, make this rotatable part rotation, till the part that is formed with the heating clamping part on the circumferencial direction at rotary part arrives aforementioned conveying clamping part.
2. image heating as claimed in claim 1 is characterized in that, this cleaning mode automatically performs after the heating process that adds the toner image on the thermal recording material finishes.
3. image heating as claimed in claim 1 is characterized in that, this well heater is heated to the melt temperature of toner or more than it when this cleaning mode.
4. image heating as claimed in claim 1 is characterized in that, when this cleaning mode, the temperature of this well heater when this rotatable part begins to rotate is lower than the melt temperature of toner.
5. as image heating as described in the claim 4, it is characterized in that when this cleaning mode, the temperature of this well heater when this rotatable part begins to rotate is lower and more than or equal to the toner softening point temperature than the melt temperature of toner.
6. image heating as claimed in claim 1 is characterized in that, the sense of rotation during this cleaning mode of this rotatable part be on these recording materials of heating toner as the time sense of rotation.
7. image heating as claimed in claim 1 is characterized in that, this image heating has a plurality of these well heaters on the circumferencial direction of this rotary part.
8. image heating as claimed in claim 7 is characterized in that, when this cleaning mode, have only the toner of heating on these recording materials as the time the well heater heating of upstream of sense of rotation of this rotatable part.
9. image heating as claimed in claim 8 is characterized in that, the sense of rotation during this cleaning mode of this rotatable part be with these recording materials of heating on toner as the time the opposite direction of sense of rotation.
10. image heating as claimed in claim 1, it is characterized in that, this supporting mechanism comprises that the slide unit, the inner peripheral surface that form this conveying pincers with this rotatable part contact the flexible sleeve insert that outer peripheral face contacts with the outer peripheral face of this rotatable part with this slide unit.
11. image heating as claimed in claim 1 is characterized in that, this rotatable part contains coefficient of heat conductivity and is≤0.15W/m.k and proportion is≤and 0.85 elastic layer.
12. image heating as claimed in claim 1 is characterized in that, this well heater has the substrate and the heating resistor parts that are formed on this ceramic substrate of ceramic.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP026238/2004 | 2004-02-03 | ||
| JP2004026238 | 2004-02-03 | ||
| JP011710/2005 | 2005-01-19 | ||
| JP2005011710A JP4537215B2 (en) | 2004-02-03 | 2005-01-19 | Image heating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1652041A true CN1652041A (en) | 2005-08-10 |
| CN100383681C CN100383681C (en) | 2008-04-23 |
Family
ID=34889311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100016250A Expired - Fee Related CN100383681C (en) | 2004-02-03 | 2005-02-03 | Photograph heater with heater for externally heating developing roll surface |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US7190914B2 (en) |
| JP (1) | JP4537215B2 (en) |
| CN (1) | CN100383681C (en) |
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| CN106054564A (en) * | 2015-04-09 | 2016-10-26 | 佳能株式会社 | Image forming apparatus |
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| CN106054564A (en) * | 2015-04-09 | 2016-10-26 | 佳能株式会社 | Image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| US7190914B2 (en) | 2007-03-13 |
| US20050207770A1 (en) | 2005-09-22 |
| CN100383681C (en) | 2008-04-23 |
| JP2005250452A (en) | 2005-09-15 |
| JP4537215B2 (en) | 2010-09-01 |
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